Is this a sudden problem or is this thrower new to you and this is the first time greasing them? I would pull the zerks and dig out everything you can in the adjuster bracket. Once it's clean shine a light in there, you should see a small hole in the bearing race to allow the grease into the bearing. Make sure that hole is not plugged with dry grease. It wouldn't hurt to try a new zerk, or swap in one that is working to test. I have a few zerks I need to push and hold my grease gun on tight while greasing to force the grease in.
If this thrower is new to you, I am wondering if the po replaced the bearings with ones that don't have the grease hole in them.
Bill
Edit: or the bearing could have spun like Mark said.
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